Statement relevancy: signed responses to summons may be admissible when the declarant is unavailable or admission serves justice.

A signed statement made in response to a summons issued under the inquiry provisions is relevant in prosecution to prove its facts when the maker is unavailable-dead, not found, incapable, kept away, or would cause unreasonable delay or expense to produce-or when the maker is examined and the court admits the statement in the interest of justice.

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